Dynamic row level security spread across multiple columns

I've a table as under:

I was able to create a relationship map using the script from here:

https://stackoverflow.com/questions/64202169/creating-an-employee-manager-relationship-table?noredirect=1#comment113529607_64202169

So the relationship table looks like as under: (employee table)

https://i.stack.imgur.com/X3ONs.png 

My main concern is how do I let any Employee or Any manager from any level view the sheet with only the SALES that pertains to them

I tried using the query :

PATHCONTAINS(employee[Merged],Maxx(Filter(employee, Column1 = USERPRINCIPALNAME()), employee[Index]))

But it throws the following error:

The syntax for [Merged] is incorrect

Would really appreciate if you could let me how do I fix it and also how do I add all the Employee's and Managers to their Roles

Thanks